integration/builder: Add Meson install/version check.

litex/soc/integration/builder.py

@@ -239,9 +239,23 @@ class Builder:
     def _generate_rom_software(self, compile_bios=True):
         # Compile all software packages.
          for name, src_dir in self.software_packages:
+
             # Skip BIOS compilation when disabled.
             if name == "bios" and not compile_bios:
                 continue
+
+            # Check Meson install/version.
+            meson_present   = (shutil.which("meson") is not None)
+            meson_version   = [0, 0, 0]
+            meson_major_min = 0
+            meson_minor_min = 59
+            if meson_present:
+                meson_version = subprocess.check_output(["meson", "-v"]).decode("utf-8").split(".")
+            if (not meson_present) or (int(meson_version[0]) < meson_major_min) or (int(meson_version[1]) < meson_minor_min):
+                msg = "Unable to find valid Meson build system, please install it with:\n"
+                msg += "- pip3 install meson.\n"
+                raise OSError(msg)
+
             # Compile software package.
             dst_dir  = os.path.join(self.software_dir, name)
             makefile = os.path.join(src_dir, "Makefile")